Oil seal
US6394463B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 30, 2000 |
| Grant date | May 28, 2002 |
| Priority date | — |
| Expiry date | Dec 13, 2020 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16J15/3276
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
The oil seal of the present invention for a valve stem includes a triple seal lip having a cam chamber side lip, a first combustion chamber side lip and a second combustion chamber side lip. Notches are provided on the second combustion chamber side lip and other notches are provided on the first combustion chamber side lip. These notches permit flow communication from the cam chamber side with the combustion chamber side. The notches provided on the combustion chamber side lip and the notches provided on the second combustion chamber side lip are placed circumferentially shifted from each other so that the notches are not axially aligned relative to the notches. Preferably, the non-notched portion is axially aligned and spaced apart relative to the notched portion. Similarly, the notched portion is axially spaced relative to the non-notched portion, such that when the valve stem moves eccentrically toward the notch on the combustion chamber side lip, the second combustion chamber side lip prevents the eccentric motion of the valve stem. When the valve stem moves eccentrically toward the notch on the second combustion chamber side lip, the combustion chamber side lip prevents the e…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.